<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        //交换两个变量
        var num1 = 'pink';
        var num2 = 'yellow';
        var temp;
        temp = num1;
        num1 = num2;
        num2 = temp;
        console.log(num1,num2)
    </script>
</head>
<body>

</body>
</html>